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Finding the Fourth Proportional to 1,191.99, 1,644.95 and 668.02

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Solution

The fourth proportional to 1,191.99, 1,644.95 and 668.02 is: 921.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.99 : 1,644.95 = 668.02 : x
  2. Step 2: Convert to fraction form
    1,191.99/1,644.95 = 668.02/x
  3. Step 3: Cross multiply
    1,191.99x = 1,644.95 × 668.02
  4. Step 4: Simplify right side
    1,191.99x = 1,098,860.27
  5. Step 5: Solve for x
    x = 1,098,860.27/1,191.99
  6. Step 6: Final answer
    x = 921.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.